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From Ellenabeich village looking over Easdale Sound to Scarba island in the distance.

Seil has been linked to the Scottish mainland since 1792 when the Clachan Bridge was built by engineer Robert Mylne. Also known as the "Bridge Over the Atlantic", the bridge is still used today and in early summer is covered in fairy foxgloves (Erinus alpinus).

Balvicar, in the centre of the island, is the main settlement with a flourishing fishing industry, the island shop, and a high percentage of houses that are occupied all year round. At the end of the road lies the former slate-mining village of Ellenabeich. This picturesque village is a conservation area with a high percentage of holiday cottages and is fully occupied only in the summer months. Parts of Ring of Bright Water were filmed here. The Ellenabeich Heritage Centre which opened in 2000, is run by the Scottish Slate Islands Trust. Located in a former slate quarry-worker's cottage, the centre has displays on life in the 19th Century, slate quarrying and the local flora, fauna and geology.[6] Ferries sail from Ellenabeich to Easdale, and from Cuan on the island to Luing. The mother of Princess Diana, Frances Shand Kydd, lived there until her death in 2004.

According to wildlife experts the entire badger population of the island may have been deliberately exterminated in 2007. Forty of the animals, whose setts were believed to be long established, may have been gassed to death, according to the police. The police also expressed concerns that two golden eagles and one white-tailed sea eagle have been found poisoned near Seil in recent years, involving use of the banned substance Carbofuran.[7][8]

Fast-flowing sea water under the 18th century Clachan Bridge that links Seil to mainland Scotland

Rae (2011) has argued that Seil could be the location of Hinba, an island associated with St Columba. His reasons include the island's association with St Brendan, its location on an inshore trade route from Antrim to the north and its suitability for a substantial settlement. He suggests that the Muirbolcmar (great sea bag) referred to in texts about Hinba could refer to the Seil Sound and narrows at Clachan Bridge where the "bag" captures the rapidly flowing water that floods under the bridge and also argues for this location on etymological grounds. Equating "Hinba" with the Gaelic Inbhir, he notes that the adjacent mainland parish of Kilninver means "church of Inbhir" and suggests that the derivation of "Seil" maybe of Scandinavian origin with similarities to the East Frisian place name Zijl or Syl meaning a "seep or passage of water". This, he proposes, could have been a Norse interpretation of Hinba/Inbhir.[9][Note 1]